Some weapons don't just do a random number of points of abstract damage. Some have their own special look-up tables of unusual damage effects,
including such wonders as crippling limbs, setting people on fire, and removing heads. Clearly, if you can get your hands on such a
weapon, this is far superior to "2d6 points of damage".

Not necessarily because it's more dangerous in game terms, but just because it's so much cooler.